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The article introduces the concept of the TBT Window, a missing front-end performance metric that highlights total blocking time between First Contentful Paint and Time to Interactive, illustrated through a case study where a client's TBT spiked from 495 ms to 5,789 ms.
Google's Chrome Lighthouse now includes an audit for llms.txt files as part of its new Agentic Browsing category, evaluating site readiness for AI agents.